The songwriter father said he was inspired by the future of his 17-month-old son Hudson when composing the song.

"I didn't suffer from bullying when I was a kid but I think about it a lot now because of Hudson," Sebastian said.

"The last time I took him out to the park, this bigger kid came up and punched him square in the face and he was so stunned for a second.

"When he looked at me, it was like a little bit of his innocence had been stolen from him because he expects the best from people."

Sebastian said he also wanted to compose a song that rewrote the rules of what teenagers and tweens thought was "cool" behaviour.

Fans will be able to record themselves singing the Dare To Be Square chorus to make a virtual choir which will be revealed during his performance at the Slimefest music festival in Sydney on September 27.

"There are rules that say you have to dress or act a certain way to be considered cool, a regime you are locked into to be accepted and this campaign aims to change that psyche as opposed to being anti something," he said.

"Being cool is being happy with who you are and confident in the fact you are different."

Sebastian hasn't ruled out fronting a television show again but is focused on writing his next album after recently scoring a US record deal.

"Maybe down the line but I'm not in that head space now because I am loving writing and am more focused on music than I have been for years because I'm not having to fly back and forth for auditions," he said.

"I can't write songs in my dressing room for only 20 minutes a day."

You can sing along with Guy Sebastian at nickelodeon.com.au from Wednesday.